Quantative Chemistry Flashcards
1
Q
How do you calculate relative formula mass
A
Add up all the atomic masses
2
Q
Give the equation for moles
A
Moles = mass/Mr
3
Q
How do you calculate the percentage mass of an element
A
Percentage mass= Ar x number of atoms/Mr x100
4
Q
Describe how you calculate the imprical formula
A
Write down the masses of both elements under their symbol. Divide the mass by the Ar. Divide both numbers through by the smallest.
Make both intergers by multiplying bith by same amount
5
Q
What is percentage yield comparing
A
Actuall yield against theoretical yield
6
Q
What is the formula for percentage yield
A
Actual yield/theoretical yield x 100
